ABO Study Guide Review OpenOptix Study Questions and Correct Solutions

Fibrous tunic, Vascular tunic, and Nervous tunic - The eye is made up of three layers, they are the: Epithelium, Bowman's membrane, Stroma, Descemets membrane and the Endothelium. - The cornea consists of 5 layers which in order from anterior to posterior are: (Erin Buys See's Desserts Everyday) Iris - The amount of light entering the eye is controlled by the: 120,6 - There are approximately____million rods located mainly in the periphery of the retina and ___ million cones located centrally in the retina. (place them in the correct order) The eye is made up of three layers, they are the: - Fibrous tunic, Vascular tunic and the Nervous tunic The cornea consists of 5 layers which in order from anterior to posterior are: (Erin Buys See's Desserts Everyday) - Epithelium, Bowman's membrane, Stroma, Descemet's membrane and Epithelium The amount of light entering the eye is controlled by the: - Iris There are approximately____million rods located mainly in the periphery of the retina and____million cones centrally in the retina. - 120,6 The term for the refractive condition where light comes to a focus directly on the retina: - Emmetropia The term for the refractive condition where light comes to a focus behind the retina: - Hyperopia The term for the refractive condition where light comes to a focus in front of the retina: - Myopia The term for the refractive condition where light comes to a focus on 2 different points: - Astigmatism The onset of presbyopia generally begins at age: - 40 The 6 extraocular muscles responsible for stabilization of the eye are: (LMS and ISI) - Lateral rectus, Medial rectus, Superior rectus, Inferior rectus, Superior oblique, Inferior oblique When the eye has a tendency to turn from it's normal position it is called: - Phoria When the eye has a definite or obvious turning from it's normal position it is called: - Tropia Phorias and tropias are further defined by their direction of movement:____as meaning outward (temporally),____as meaning inward (nasally),____as meaning downward, and____as meaning upward. (place them in the correct order). - Exo, eso, hypo, hyper We really see with our: - brain not our eyes A perfect human eye is said to be: - emmetropic Everyone will suffer from____if they live long enough. - presbyopia Astigmatism means that the patient's cornea is: - misshapen The fibrous tunic consists of the - Sclera and Cornea Fusion occurs in the - Brain Aqueous humor is produced by the - Ciliary body The index of refraction of the cornea is - 1.37 When light entering the eye, without corrective lenses, comes to a focus partially in front of the retina and partially in back of the retina, the patient's refractive error is: - Mixed astigmatism When light entering the eye, without corrective lenses, comes to a focus in front of the retina, the patient's refractive error is: - Fibrous tunic, Vascular tunic and the Nervous tunic The patient normally has no need for any visual correction for distance, but does require prescription lenses to see well at near. This patient's refractive error is known as: - Presbyopia An Rx with the OD. Minus and the O.S. plus is an obvious case of: - Antimetropia Accommodation is defined as: - the act of the crystalline lens changing its shape to focus for objects at varying distances The speed of light is: - 186,000 miles/second The wavelength of 700nm is seen as what color: - Red In a minus powered lens light rays____and come to a focal point____the lens. - Diverge, in front of Light rays pass through a lens and converge at a point 50cm behind the lens, what is the power? - 2.00D 1 Prism Diopter can be described as deviating a ray of light: - 10 centimeters/1000 centimeters 3 Prism Diopters base in on the right eye can also be described as: - 3 @ 000° Using Prentices Rule a -4.00 lens must be decentered____to induce 1.00 Prism Diopter: - 2.5mm The index of refraction is lowest in - air When the direction of light changes as it passes from one medium to another, it is called - Refraction The focal length of a +2 diopter lens is - (+50cm)